RNA 4910 2RS SKF 58x72x22 Needle Roller Bearing

RNA 4910.2RS SKF 58x72x22 - Needle Roller Bearing Without Inner Ring

RNA 4910.2RS SKF is a single row needle roller bearing with dimensions of 58x72x22 mm, featuring a machined outer ring with flanges and contact seals on both sides. The bearing has no inner ring, so the shaft acts directly as the raceway for the needle rollers. This design provides high radial load carrying capability with a compact radial cross-section and is supplied grease lubricated.

Technical data - RNA 4910.2RS SKF

Manufacturer: SKF

Full designation: RNA 4910.2RS

Bearing type: single row needle roller bearing

Design: machined-ring needle roller bearing with flanges, without inner ring

Fw - diameter under needle rollers: 58 mm

D - outside diameter: 72 mm

B - width: 22 mm

Dimensions: 58x72x22 mm

Number of rows: 1

Inner ring: none

Outer ring: machined

Outer ring flanges: 2

Cage: steel

Sealing: both sides

Seal type: contact seals

Factory lubrication: grease

Relubrication: possible

C - basic dynamic load rating: 40.2 kN

C0 - basic static load rating: 69.5 kN

Pu - fatigue load limit: 8.5 kN

Limiting speed: 3400 r/min

Mass: approximately 0.16 kg

What does RNA 4910.2RS mean?

The complete designation identifies the bearing design and execution.

RNA 4910 - needle roller bearing with a machined outer ring and flanges, without an inner ring.

2RS - contact seals on both sides of the bearing.

In current SKF documentation, the designation can be written as:

RNA 4910.2RS

Older SKF materials can also contain the format:

RNA 4910 2RS

Both formats refer to the sealed version of this bearing design.

Dimensions of RNA 4910.2RS SKF

The principal dimensions are:

Fw: 58 mm

D: 72 mm

B: 22 mm

Therefore:

58x72x22 mm

For this bearing, 58 mm is not a conventional bore diameter of an inner ring because the bearing does not have an inner ring.

It is the diameter under the needle rollers, designated Fw.

This distinction is important when designing the shaft and selecting the bearing.

Needle roller bearing without an inner ring

RNA 4910.2RS SKF does not have a separate inner ring.

The shaft operates directly against the needle rollers and functions as the inner raceway.

Eliminating the separate inner ring makes it possible to create a compact bearing arrangement and use a larger shaft diameter for a given bearing outside diameter.

However, this design requires an appropriately prepared shaft raceway.

The surface operating directly against the needle rollers must meet the dimensional accuracy, geometry, hardness and surface finish requirements applicable to a bearing raceway.

Machined outer ring design

RNA 4910.2RS has a solid machined outer ring.

The outer ring incorporates two integral flanges that guide the needle roller and cage assembly.

This construction combines a small radial cross-section with high radial load carrying capability and rigidity.

Needle roller bearings of this type are particularly useful where radial installation space is limited.

What does 2RS mean?

2RS indicates sealing on both sides of the bearing.

RNA 4910.2RS SKF is equipped with contact seals on both sides.

The seals help prevent contaminants from entering the bearing and help retain lubricant in the operating zone.

The 2RS version therefore differs from the open RNA 4910 version.

The presence of contact seals also affects permissible operating speed.

Lubrication

RNA 4910.2RS is supplied grease lubricated.

The bearing design also provides the possibility of relubrication.

Correct lubrication is particularly important for the service life of the raceways and needle rollers because of the high contact stresses associated with needle roller bearings.

Lubricant type, quantity and relubrication interval should correspond to the operating conditions of the specific bearing arrangement.

Load ratings of RNA 4910.2RS SKF

SKF specifies the following ratings for RNA 4910.2RS:

C - basic dynamic load rating: 40.2 kN

C0 - basic static load rating: 69.5 kN

Pu - fatigue load limit: 8.5 kN

The needle roller bearing is designed primarily to carry radial loads.

The large number of needle rollers and line contact between the rolling elements and raceways provide high radial load carrying capability relative to the bearing cross-section.

Speed rating

The limiting speed of RNA 4910.2RS SKF is:

3400 r/min

For the sealed RNA 4910.2RS version, SKF does not specify a reference speed in the relevant catalogue table.

The 7000 r/min reference speed specified for the open RNA 4910 should not be transferred to the RNA 4910.2RS version.

Contact seals generate additional friction, which means that the sealed bearing has different speed limitations from the open version.

RNA 4910.2RS vs RNA 4910

Both bearings have principal dimensions of 58x72x22 mm and neither has an inner ring.

RNA 4910 is an open bearing.

RNA 4910.2RS has contact seals on both sides.

The catalogue load and speed ratings also differ.

RNA 4910.2RS:

C - 40.2 kN

C0 - 69.5 kN

Pu - 8.5 kN

Limiting speed - 3400 r/min

RNA 4910:

C - 47.3 kN

C0 - 85 kN

Pu - 10.6 kN

Reference speed - 7000 r/min

Limiting speed - 8000 r/min

Therefore, the catalogue parameters of the open version should not automatically be applied to the 2RS version.

RNA 4910.2RS vs RNA 4910 RS

RNA 4910 RS has a seal on one side.

RNA 4910.2RS has seals on both sides.

The exact designation required by the machine or bearing arrangement should always be retained when selecting a replacement.

Shaft as the inner raceway

Because RNA 4910.2RS does not have an inner ring, the shaft surface acts directly as the raceway for the needle rollers.

This makes it possible to create a very compact bearing arrangement.

At the same time, the quality of the shaft raceway directly affects bearing accuracy, load carrying capability and service life.

A standard untreated shaft surface should not automatically be considered suitable as a raceway for this bearing.

Axial displacement

The design without an inner ring can allow axial displacement of the shaft relative to the housing in both directions.

The possible displacement is primarily limited by the width of the correctly prepared raceway on the shaft and by the design of the complete bearing arrangement.

The bearing itself is not intended to provide axial location of the shaft.

Alternative designations and reference formats

Natural designation and search variants include:

RNA 4910.2RS SKF

SKF RNA 4910.2RS

RNA4910.2RS SKF

SKF RNA4910.2RS

RNA 4910 2RS SKF

SKF RNA 4910 2RS

RNA4910 2RS SKF

RNA4910-2RS SKF

RNA 4910 2RS 58x72x22

SKF RNA 4910 2RS 58x72x22

For precise technical identification, the recommended designation is:

RNA 4910.2RS SKF

Selection and interchangeability

Before selecting an equivalent bearing, check:

• complete bearing designation

• manufacturer

• dimensions 58x72x22 mm

• design without inner ring

• Fw diameter of 58 mm

• contact seals on both sides

• load ratings

• permissible speed

• cage design

• lubrication

• relubrication requirements

• shaft raceway requirements

• mounting and operating conditions

Identical external dimensions alone are not sufficient to confirm complete interchangeability.

Applications

RNA 4910.2RS is designed for compact bearing arrangements requiring high radial load carrying capability, high rigidity and limited radial installation space.

The absence of an inner ring is beneficial in arrangements where a suitable raceway can be produced directly on the shaft.

Contact seals on both sides help protect the bearing interior against contaminants and retain lubricant.

Selection for a specific machine should always consider load, speed, shaft preparation, lubrication, temperature and environmental conditions.

Installation and operation

When installing RNA 4910.2RS:

• maintain a high level of cleanliness

• protect the contact seals against damage

• inspect the condition of the shaft raceway

• ensure the correct outer ring fit

• avoid damaging the needle rollers when inserting the shaft

• provide appropriate lubrication conditions

• observe the applicable speed limitations

Particular attention should be paid to the shaft surface because it functions directly as the inner raceway.

FAQ - RNA 4910.2RS SKF

What are the dimensions of RNA 4910.2RS SKF?

The bearing dimensions are 58x72x22 mm. The 58 mm value is the diameter under the needle rollers Fw, the outside diameter is 72 mm and the width is 22 mm.

Does RNA 4910.2RS have an inner ring?

No. It is a needle roller bearing without an inner ring. A correctly prepared shaft surface operates directly as the raceway for the needle rollers.

What does 2RS mean?

2RS indicates contact seals on both sides of the bearing.

What are the load ratings of RNA 4910.2RS SKF?

The basic dynamic load rating C is 40.2 kN, the basic static load rating C0 is 69.5 kN and the fatigue load limit Pu is 8.5 kN.

What is the limiting speed of RNA 4910.2RS?

SKF specifies a limiting speed of 3400 r/min for the RNA 4910.2RS version.

Are RNA 4910 and RNA 4910.2RS identical?

No. RNA 4910 is an open bearing, while RNA 4910.2RS is sealed on both sides. The versions also have different catalogue load and speed ratings.

Does the shaft require special preparation?

Yes. Because the bearing does not have an inner ring, the shaft surface functions as the raceway and must meet the appropriate requirements for hardness, dimensional and geometrical accuracy, and surface finish.

Is RNA 4910.2RS supplied grease lubricated?

Yes. The sealed version is supplied grease lubricated and the design also provides the possibility of relubrication.

RNA 4910.2RS SKF - key information

RNA 4910.2RS SKF is a single row needle roller bearing measuring 58x72x22 mm, sealed on both sides and manufactured without an inner ring. The shaft acts directly as the needle roller raceway. The bearing has a dynamic load rating C of 40.2 kN, static load rating C0 of 69.5 kN and limiting speed of 3400 r/min.

Available from simmering.pl, a specialist supplier of bearings and industrial sealing solutions. Stock in Poland with worldwide shipping. We can also assist with bearing identification and selection of the correct bearing variant.